Paper-making machine.



H. GAARA.

PAPER MAKING MACHINE.

, APPLIOATION FILED MAY 11. 1907.

Patented Mar. 8, 1910.

3 SHEETS-SHEET 1.

I l/VVE/VTOI? I AfTOR/VEV WITNESSES.-

H. GAARA.

PAPER MAKING MACHINE.

APPLICATION FILED MAY 11, 1907.

Patented Mar. 8, 1910.

3 SHEETS-SHEET 2.

INVENTOR a/y 2, ,fQa/L a,

WITNESSES: W B

W ATTORNEY H. GAARA.- PAPER MAKING MACHINE.

APPLICATION FILED MAY 11, 1907.

95 1 ,1 83, Patented Mar. 8, 1910.

3 SHEETS-SHHET 3.

6 7/vwad w, W

HALVOR: GAALRA, or ew YORK, N. Y.

PAPER- MAKING MACHINE.

Speeiflcation of Letters Patent.

Application filed May 11, 1907. Serial No. 873,166.

To all whom it may concern.

Be it known that I, HALVOR GA'ARA, a subj ect of the King of Norway, residing at New York city, in the county of New York and State of New York have invented certain new and useful Improvements in Paper- Making Machines, of which the following is a specification.

My invention relates to the manufacture of paper and the object of my invention is to provide means whereby practically all the fibrous substances in the pulp, whilethe latter passes on to the wire cloth, are saved. For this purpose, cylinders covered by a cloth have been used, which were arranged in such aposition that the water draining from the wire cloth had to pass a vat in which said cylinder is rotatably mounted. With these cylinders, however, a considerable amount of the short fibers of the pulp is lost by passing through the pores or openings in the cloth surrounding the. cylinder. This loss of short fibers may be reduced by the employment of a very fine cloth, but the effect of such cloth is soon destroyed, as the fine pores in said cloth become clogged up after a short time. According to my present invention,these disadvantages may be entirely overcome by arranging the cylinder for catching the fibers in the path of flow of the pulp on its way to the wire cloth in such a manner, that not only is all or a part of the pulp coming from the pulp vat forced to pass through the tank containing the cylinder, but also the water drained through the meshes of the wire cloth. Previously, the

fiber catching cylinders were so arranged,

that only the water drained from the wire cloth passed through said cylinders.- This water, however, contains only a small amount: of long fibers, and most of the short fibers passing through the cloth surrounding the cylinder are lost thereby. By reason of the arran ement of the fiber-catching path of cylimir in the flow of the pulp on its way to the wire-cloth,- as in accordance with my invention, a portion of the long fibers will be de osited on the-cloth surrounding the cylin er, while during the rotation of said cylinder the cloth di s into the water-tank in which said cylin er rotates. The long fibers thus de osited on the cloth, form on the outer sur ace thereof a filtering layer, whereby the short fibers are prevented from passing through the pores or openings of the cloth during the rotation of the cylinder.

For the purpose of more clearly settinfg forth my invention and pointing out the di ferent features of the new arrangement, reference is made to the accompanying drawings', in which- Flgure 1 is 'a diagrammatic plan view, showlng the location of the fiber-catching cylinder,-Whereas Figs. 2 and 3 are sectional views-of the cylinder, with some of the cooperating parts, showing two different forms of the cylinder.

Referring first to Fi 1, 1 and 1 indicate the conduits or channe s for conducting the pulp from the agitating vat 2 to the wire cloth 3 of the paper machine, the usual screen 4 and distributing box 5 bein inter posed. 6 designates the tank, in WhlCh the fiber-catching cylinder 7 is rotatably mounted. The water draining through the wire cloth 3- is conducted through a passage 8 to a receptacle 9, from which it is-pumped by a pump 10 of any desired construction through a pipe 11 into the vessel 12. From said vessel either all the watera-orpart of it, is returned-by a pipe 13 to the conduit or channel 1, where 1t a ain is mixed with Patented Mar. 8, 1910.

the'pulp flowing from t e vat 2. Part of the water pumped into the vessel 12 may be allowed to escape through a pipe 14 into a trough 15, which trough is in unobstructed communication with the said conduit 1, but is provided with an overflow 16, whereby the level in the said conduit and in the cylinder-tank 6 is kept uniform. The water passing the overflow 16 is returned by a pipe 17 to the tank 9, where it again mixes with the water draining through the wire cloth 3. The water 18 (Fig. 2) which is separated from its fibers by the cylinder 7, passes through a passa e 19 (Fig. 1) into a passage 20, the latter ein provided with an overflow 21, so arrang that part of the water flowing from assage 19 into passage 20 can be discharged back into the tank 9, while the water passing the overflow 21 is allowed to run away.

22 indicates a pipe, through which the pulp caughtby the cylinder 7 and removed therefrom is carried into the conduit 1, in a manner described'later. The flow through .said pipe 22 can be regulated by a valve In communication with the conduit 1 there is arranged a passage 23, passing outcatching cylinder is shown.

side of the cylinder tank 6. A gate or slide 24 is provided at the oint where the said passage 23 branches 0 from the conduit 1. If the gate or slide 24 is removed from its place and placed inthe ponduit 1, at A, all the pulp discharged from the vat 2 will flow through passage 23 outsideof the tank 6 into the conduit 1 behind the tank 6 without first passing through the tank 6. As seen in Flg. 1, a second gate or slide 24 is arranged in the passage 23, where it opens into the conduit 1 Said gate 24 will be removed to B, when gate 24 is removed and will be replaced again, after gate 24 has been replaced. An extension 25 of said branch conduit 23 connects the latter directly with the vat 2, and a gate'or slide 26 similar to the ates 24 and 24 is so arranged, that eit er the whole, or part, of the pulp from the vat 2 together with the water from the pipe 13 can flow directly through the conduit 23 into the box 4.

In Fig. 2 a preferable form of a fiber- As seen from said figure, the cylinder is provided on its inner periphery with a row of ribs or shelve's 27, which rotate with the cylinder, directing the water passing through the pores or openings in the cylinder cloth into a stationary pan 28. The latter extends through the entire length of the cylinder and is provided with a hollow shaft 29, supported'in bearings provided in the walls of the tank 6. To one end ofthe said shaft 29, ardund which the cylinder 7 rotates, is connected-a pipe 30 (see Fig. 1),,so that the water collected in the pan 28 and assing from said pan into the hollow sha t 29 flows through the pipe 30 into the tank 9. The pulp carrying water which is discharged from the bottom of the cylinder I the cloth of the cylinder.

tank 6 through a pipe 31 is lifted by a pump 32 through a p1 e 33 into a pipe 34 arranged above the cy inder 7 and extending across the same. Tliesaid pipe 341s provided with a longitudinal slot 35, through which a sheet of water is forced in a tangential direction a ainst the cloth fastened to the periphery o the cylinder 7, whereby the fibers deposited on said cloth are washed ofi", as clearly seen in Fig. 2. As shown in said figure, a'shield 39 is arranged in the tank 6, partly surrounding the cylinder 7. The purpose of this shield is to create a current from the bottom of the tank 6, so as to well mix. the water in said tank with the fibers washed off from At the lower end of the. said shield 39 is arranged a flap-valve 39' of leather or other suitable material,-

which, if the level of the water in the tank 6 falls below a certain height, will open auinto pipe 34 flows from'said pipe through pipe 22 into the conduit 1, and screen 4. and

on to the wire cloth 3.

According to the arrangement shown in Fig. 3, the cloth 40 surrounding the cylinder 7 is not fastened thereto, but leaves the same near the top end and is guided over rollers a, Z), c and d. The roller 1; is located in' a channel 41 and while the cloth passes over and around said roller on to roller 0, a streamvof water is directed against the cloth, as in the arrangement shown in Fig. 3. The water used for this purpose is the pulp-carrying water drawn ofi from the bottom of the tank 6 through pipe 31. As in Fig. 2, water is forced by pump 32 through pipe,33 into pipe 34, which is provided with a longitudinal slot 35, through which the water is forced against the cloth passing around roller Z). The excess of water lifted by pump 32 .is forced through a pipe 36 into a small tank 37' from which it is returned through a pipe 38 to the suction side of the pump. 'Also the pulp in the channel 41 is carried together with the water forced out of the pipe 34 back to the suction side of the pump 32, whereas. a large amount of water in pipe 34 passes on through pipe 22" into the conduit 1. i

As seen from Fig.1, a pipe 42 is provided connectin the distributing box 5 with the tank 9fi1ut normally the said pipe 42 jis closed by a valve or slide 43. If, however, for some reason the paper machine is stop ed, the said slide 43 is opened to let the pu p-carrying water pass from the said box 5 directly into the tank 9.

44 in Figs. 2 and 3 designates a pipe, connected, with some water supply and provided with a row of rforationsthrough which fresh water is directed onto the cloth surrounding the cylinder 7.

In Fi 2 a board 45 is shown, which is removab y secured to one wall of the cylinder tank 6 in such a position, as to be on a. level with the water in said tank. The said board extends across the entire length of the cylinder tank in close connection therewith except for a narrow space 8 near the cylinder to permit the water to pass through.

The purpose of said board 45 is to prevent ters Patent is discharged at a point into the conduit 1" between the cylinder tank 6 a'nd screen 4.

The purpose of this arrangement is to add,

water to the pulp flowing on to the wire cloth 3, if necessary. A valve 11 is provided in said branch 11 to regulate the amount of water discharged therefrom.

What I claim and of the pulp-water from said chest to said wire and means to conduct some of the water, after its passage through 's'ald wire, back into said tank;

2. In a paper-making machine or the like,

the combination with. the stuff-chest and the machine-wire, of a tank to receive the pulp 7' Water coming from said chest, a, rotary straining-cylinder in said tank, a pump 32, to draw the water from the bottom of said tank, a pipe connected to said pump to convey the water, to said Wire, and a pump 10,

through said wire and return it to said tank.

3. In a paper-making machine or the like the combination withthe stuff-chest and the machine-wire, of a tank to receive the pulp-. water coming from said chest, a rotary straining-cylinder in said tank, a pump 32, which draws the water from said tank and delivers somelof it to said wire and some onto said cylinder, and a pump 10, to draw some of the water, after its passage tl'n'ough said wire and return it to said tank.

4. In a paper making machine, the combination with a pulp vat, and a wire-cloth arranged to receive the pulp from said vat, of a tank arranged in the flow of the pulp carrying water, a fiber-catching cylinder rotatably mounted in said tank, means for drawing oif the pulp-carrying water from said tank and conducting it to the said wirecloth and a supplementary conduit connected with the said conduit and passing outside of the said tank to conduct the pulpcarrying water directly to the said wirecloth, and means for regulating the amount of pulp-carrying water passing through said supplementary conduit.

5. In a paper makingmachine, the combination with a pulp vat, and a wire-cloth arranged to receive the pulp from said pulp vat, of a tank arranged in the flow of the pulp carrying water, a fiber-catching cylinder arranged in said tank and adapted to rotate therein, means for drawing off the pulp water at the bottom of said tank and wish to secure by Letpassing it on to the wire-cloth, and means located above said cylinder to wash off the fibers adhering to the. surface thereof and mixing them with the water drawn olf at the bottom of said tank.

6. a papermaking machine, the combination with a pulp vat, and a wire cloth adapted to'receive the pulp from said vat, of a tank arranged in the flow of pulp. from the vat to the said wire-cloth, afiber-catching cylinder immersed in said tank and f adaptedto rotate therein, meansfor drawing off the pulp-Water from said tank, means locatedinear the upper portion of the said cylinder to remove the fibers adhering to its surface, and a shield arranged in said tank and partly surrounding the said cylinder i and adapted to produce an upward flow of the pulpwater in said tank, thereby mixing with the same the fibers removed from the surface of said cylinder.

7. In a paper making machine; the combination with a pulp-vat and a wire-cloth adapted to receive the pulp from said vat, of a tank arranged in the flow of pulp water from the said vat to the said wire cloth, a fiber-catching cylinder immersed in said tank and adapted to rotate therein, means for drawing off the pulp-water from said to draw some of the water, after itspassage.

tank, means located near the upper portion of the said cylinder to remove the fibers adhering to its surface, a shield partly surrounding said cylinder and adapted to produce an upward flow of the pulp-water in said tank, thereby mixing with the same the fibers removed from the said cylinder, and

a valve at the lower end of said shield normally preventing the circulation of water around said lower end and adapted to open automatically to permit the water in the tank to be drawn ofl past the said lower end, if the water in said tank falls under a certain level.

8. In a paper' making machine, the combination with a pulp vat and a wire-cloth arranged to receive the pulp-water from said vat, of a tank located in the flow of said water, a fiber-catching cylinder arranged in said tank and ada ted to rotate therein, a

ump to draw 0 the pulp-water at the ottom of the tank and lifting the water to a pipe arranged above the said cylinder in the tank and provided with a longitudinal slot to discharge a sheet of water against,

arranged to receive the pulp-water from said vat, of a tank located in the flow of said water, a fiber-catching cylinder in'said tank adapted to rotate therein,f-a.- pump to draw off the pulp-water at the bottom of said tank and lifting the water to a pipe arranged above the said cylinder in the tank and provided with a longitudinal slot to discharge a sheet of water against the outer peri hery of said cylinder thereby washing 0% the fibers adhering thereto, a pipe in connection with the said first pipe to conduct the pulp-water to the wire-cloth, and a tank in connection with the said first pipe to receive the excess of the pulp-water lifted by said pump, and means connected with said tank to return the water therein to the suction side of said pump.

10. In a paper making machine, the combination with a pulp vat and a wire cloth arranged to receive the pulp from said pulp vat, of a tank arranged in the flow of the pulp-carrying Water, a fiber-catching cylinder arranged in said tank and mounted to rotate therein, means for drawing off the pulp-water from said tank and passing it on to the said wire cloth, means to re move the fibers adhering to the surface of the said fiber-catching cylinder and mixing them with the water drawn oil from the said tank, and means for regulating the level of the pulp carrying water in said tank.

In testimony whereof I affix my signature in presence of two witnesses.

HALVOR GAARA. Witnesses:

ALFRED MILLER, LOUISE H. STAADEN. 

